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Retirement Savings Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Retirement Plans [Line Items] |  |  |
Employees' contributions at a rate | 3.00% |  |
Matching Contribution Percentage | 50.00% |  |
Employees' contributions at a rate | 2.00% |  |
Matching Contribution Amount | $ 1.5 | $ 1.6 | $ 1.1
Matching Contribution Percentage | 100.00% |  |

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Employer Match Percentage + References No definition available. + Details
Name: | vrts_DefinedContributionPlanEmployerMatchPercentage
Namespace Prefix: | vrts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Maximum Employer Match Percentage For First Compensation Slab + References No definition available. + Details
Name: | vrts_DefinedContributionPlanMaximumEmployerMatchPercentageForFirstCompensationSlab
Namespace Prefix: | vrts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Maximum Employer Match Percentage For Next Compensation Slab + References No definition available. + Details
Name: | vrts_DefinedContributionPlanMaximumEmployerMatchPercentageForNextCompensationSlab
Namespace Prefix: | vrts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | vrts_RetirementPlansLineItems
Namespace Prefix: | vrts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration